9.1 Energy changes in chemical reactions

Reactions that release, or give out, heat are called ..............................................

• endothermic.

• exothermic.

Reactions or changes that take in heat from the surroundings are called ................................... reactions.

• endothermic.

• exothermic.

Melting is considered an............................................... process.

• endothermic.

• exothermic.

Evaporation is considered an............................................... process.

• endothermic.

• exothermic.

Mixing dilute hydrochloric acid and sodium hydroxide is an.......................................reaction/process.

• endothermic.

• exothermic.

Mixing sodium hydrogen carbonate with citric acid is an.......................................reaction/process.

• endothermic.

• exothermic.

Dissolving ammonium chloride is an .................................... process.

• endothermic.

• exothermic.

Dissolving potassium nitrate is an .................................... process.

• endothermic.

• exothermic.

Dissolving copper sulfate is an .................................... process.

• endothermic.

• exothermic.

Dissolving ammonium nitrate is an .................................... process.

• endothermic.

• exothermic.